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Electric motor and machine tool

Active Publication Date: 2018-09-13
FANUC LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention provides an electric motor that uses multiple cooling fans and arranges them in a way that ensures optimal cooling performance. This prevents a rapid decrease in cooling performance that might occur if one of the fans fails. This invention also provides a machine tool that uses this electric motor for improved cooling performance.

Problems solved by technology

Thereby, the natural frequency thereof is lowered, and a cooling fan or the like is likely to be damaged by resonance, in some cases.
In the structure disclosed in Patent Document 2, the cooling performance of a cooling fan is lowered, or the structure has difficulty in designing and manufacturing, in some cases.
In addition, usage of one cooling fan in general has a problem that the cooling performance in the motor is greatly lowered when the cooling fan fails.

Method used

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  • Electric motor and machine tool
  • Electric motor and machine tool
  • Electric motor and machine tool

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Experimental program
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first embodiment

[0029]An electric motor according to the first embodiment is described with reference to FIG. 1 and FIG. 2. FIG. 1 is a cross sectional side view of the electric motor according to the first embodiment. FIG. 2 is a view of the electric motor according to the first embodiment as viewed from the rear side thereof (other end side) in the axial direction. The axial direction herein means a direction in which a rotary axis X of a rotary spindle 31 of a rotor 3 (described below) extends (rotary axis direction DX). The front side in the axial direction (one end side in the rotary axis direction DX) herein means the side of a main-spindle attachment surface 411 attached to a main spindle 11 of a machine tool 10, meaning the left side in FIG. 1, as an example. The rear side in the axial direction (other end side in the rotary axis direction DX) herein means the side of an end face part 44 of a third housing part 43, meaning the right side in FIG. 1, as an example.

[0030]An electric motor 1 ac...

second embodiment

[0061]Next, an electric motor 1A according to the second embodiment is described with reference to FIG. 3 and FIG. 4. FIG. 3 is a cross sectional side view of the electric motor according to the second embodiment. FIG. 4 is a view of the electric motor according to the second embodiment as viewed from the rear side thereof (other end side) in the axial direction.

[0062]As shown in FIG. 3, the electric motor 1A according to the present embodiment is an electric motor with a through hole, which has a through hole 140 for supplying coolant to a rotary spindle 31A.

[0063]As shown in FIG. 3, the rotary spindle 31A has the through hole 140 formed to go through from one end to the other end in the rotary axis direction DX. The through hole 140 is a through hole for supplying coolant liquid from the rear end to the front end in the axial direction.

[0064]In the present embodiment, a rotary joint part 160 (rotary member 161) for supplying coolant liquid is connected to a rear end part 311A on t...

third embodiment

[0070]Subsequently, an electric motor according to the third embodiment is described with reference to FIG. 5 to FIG. 7. FIG. 5 is a cross sectional side view of the electric motor according to the third embodiment. FIG. 6 is a view of the electric motor according to the third embodiment as viewed from the rear side thereof (other end side) in the axial direction. FIG. 7 is a view of the electric motor according to the third embodiment as viewed from the rear side (other end side) in the axial direction, illustrating a state in which an opened part is formed.

[0071]As shown in FIG. 5, an electric motor 1B according to the third embodiment is a general solid-shaft electric motor. In the electric motor 1B according to the present embodiment, the opened part 45 formed on the rear side in the axial direction according to each of the first embodiment and the second embodiment is not indispensable. Therefore, in the present embodiment, an openable part 46 is formed in a third housing part ...

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Abstract

An electric motor includes a stator having a tubular shape, a rotor rotatable around a rotary axis and having a rotary spindle, a first housing part disposed so as to partially house the rotary spindle, a second housing part disposed at the other end of the stator in the rotary axis direction, a third housing part at a side opposite to the first housing part in the rotary axis direction with respect to the second housing part, a plurality of ventilation parts formed so as to communicate with at least the stator, the second housing part, and the third housing part, and a plurality of fans for ventilating the plurality of ventilation parts, the plurality of fans being disposed in the third housing part on a plane perpendicular to the rotary axis so as not to overlap the rotary axis.

Description

[0001]This application is based on and claims the benefit of priority from Japanese Patent Application No. 2017-046216, filed on Mar. 10, 2017, the content of which is incorporated herein by reference.BACKGROUND OF THE INVENTIONField of the Invention[0002]The present invention relates to an air-cooled electric motor and a machine tool including the electric motor.Related Art[0003]A main spindle in a recent machine tool rotates at a higher speed, and concurrently a motor (electric motor) connected to such a main spindle also rotates at a higher speed. Such a high-speed rotating motor requires high accuracy balance correction to a rotor so as to prevent excessive vibration during high-speed rotation. Therefore, motors each configured to have a balance correcting component on the rear side thereof are increasing.[0004]Many machine tools adopt a center through cooling type. In this case, a motor having a spindle with a through hole is used. In general, such a motor is configured to have...

Claims

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Application Information

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IPC IPC(8): H02K9/24H02K5/18H02K5/22H02K7/04H02K7/14H02K9/04
CPCH02K9/24H02K5/18H02K5/225H02K7/04H02K7/14H02K9/04H02K5/20H02K2213/06
Inventor NAKAZAWA, YASUYUKI
Owner FANUC LTD
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